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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd00f75c0d9710d6784beaa04b3555d98333cdce2ce6c3291f2458def3bf4273' 
  AND token = 'B0no/Q+vvKFW5J6y+6885TBt4CEhN0nnUM/DiH0xJP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}